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    • 1. 发明申请
    • Shaped Steel Excellent in Fire Resistance and Producing Method Therefor
    • 形状优良的耐火钢及其制作方法
    • US20080302453A1
    • 2008-12-11
    • US11658348
    • 2005-07-26
    • Suguru YoshidaKazuhiko EdaHiroshi Kita
    • Suguru YoshidaKazuhiko EdaHiroshi Kita
    • C21D6/02C22C38/00
    • C22C38/12
    • A shaped steel, such as H-shaped steel, excellent in fire resistance, where a flange portion has 50% or more of a ratio of strength, 80% or less of yield ratio, and 100 J or more of impact strength of Charpy impact test at 0° C., wherein the ratio of strength=(proof stress of 0.2% at 600° C.)/(yield strength at room temperature), and a producing method thereof are provided. The shaped steel comprises in mass percent (%): C: 0.03-0.15; Mo: 0.1-0.6; V≦0.35; and N: 0.002-0.012, and the balance being iron and residual impurities, wherein (x) a mol fraction of precipitate of alloy carbides and alloy carbonitrides at 600° C. is 0.3% or more, and (y) the ratio of the mol fraction of precipitate of alloy carbides and alloy carbonitrides at 300° C. to the mol fraction of precipitate of alloy carbides and alloy carbonitrides at 600° C. is 2.0 or less.
    • 一种成形钢,如H型钢,其耐火性优异,法兰部分具有50%以上的强度比率,80%以下的屈服比,100J以上的冲击强度为Charpy冲击强度 在0℃下进行试验,其中强度比=(600℃下的0.2%的屈服应力)/(室温下的屈服强度)及其制造方法。 成型钢的质量百分比(%):C:0.03〜0.15; Mo:0.1-0.6; V <= 0.35; 和N:0.002-0.012,余量为铁和残留杂质,其中(x)合金碳化物和合金碳氮化物的析出物在600℃下的摩尔分数为0.3%以上,(y) 合金碳化物和合金碳氮化物在300℃下的析出物的摩尔分数与合金碳化物和合金碳氮化物在600℃下的沉淀物的摩尔分数为2.0以下。